Improvement in sash-balances



UNITED STATES PATENT OFFICE.

EDWIN H. HANNUM, OF WILMINGTON, DELAWARE.

' IMPROVEMENT IN SASH-BALANCES.

Specification forming part of Letters Patent No. 166,363, dated August3, 1875; application riled February 8, 1875.

To all whom it may concern:

Be it known that I, EDWIN H. HANNUM, of Wilmington,in the county of NewCastle and State of Delaware, have invented a new and useful Improvementin Sash-Holders, of which the following is a specification:

In the annexed drawing making part of this specification, Figure 1 is anelevation of a window with my device applied. Fig. 2 is a sectionalelevation of the same, and Fig. 3 is a transverse section.

The same letters are employed in all the figures in the designation ofidentical parts.

Instead of the ordinary pulleys, cords, and weights, Iemploy a rack, A,engaging a spurpinion, B, on each side of the sash. A flat spring, 0, iscoiled around the spindle of the spur-pinion. I have illustrated thespring in the drawing as applied to the lower sash, and the tension ofthe spring is such that it will more than compensate for the weight ofthe sash, and as it is wound up like the mainspring of a watch indrawing down the sash, by merely releasing the detents which confine thepinion B, the spring will lift the sash. This detent consists of aratchet-wheel, D, on the end of the spindle projected through the casingof the window, and turning in a bearing, E. A pawl, F, formed as shown,is pivoted on the 'windowcasing, and has a spring, G, bearing againstit, so as to keep the point engaged with teeth of the ratchet. When thebeen before known in this combination with the Y rack-pinion and springof an automatic detent. The pawl and detent may be covered by a caphaving a segmental slot, to permit the projection of a pin on the end ofthe pawl, which is all of the device that need be in sight.

What 1 claim as my invention, and desire to secure by Letters Patent,is-

In combination with the window-sash operated by the rack-pinion andspring, the ratchet D, placed outside the casing on the spindle of thepinion, and the automatic detent F Gr, substantially as set forth.

In, testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWIN H. HANNUM. Witnesses:

H. HARMAN, A. D. OHAYTON.

